PTEROMALIDAE OF N.W. EUROPE 39 



sunny days in May and June, females may be seen searching for their hosts on the 

 boles and branches of old trees (particularly Salix and Corylus) attacked by beetles. 

 I have watched females marching to and fro, rather slowly and deliberately, their 

 antennae tapping on the wood ; after walking a few inches they turn abruptly (like 

 a sentry on duty) and proceed in the opposite direction. May- June ; some records 

 for July and August. 



Westwood (1839, Introd. Mod. Class. Ins., 1 : 272) stated that depressus had been 

 reared as a parasite of the larvae of china hederae [Mull. ; — ptinoides Marsh.] 

 (Col., Anobiidae) on a crab-tree covered with ivy. Lichtenstein (1919 : 273) 

 recorded it in France as having emerged in October from branches of a nut-tree in 

 which there were numerous larvae of Gracilia minuta F. (Col., Cerambycidae) , and 

 stated that he had also been given a specimen which had emerged from branches of 

 " ronce " [Rubus] which were similarly attacked by Gracilia. Thompson (1946 : 

 269) wrongly cited the above host as " Gracilaria " [Lep.]! 



Cleonymus obscurus Walker 



Cleonymus obscurus Walker, 1837 : 352, <$. 



Cleonymus depressus Thomson, 1878 : 5-6, $. [nee Fabricius, 1798]. 



Cleonymus thomsoni Erdos, 1957 : 3 01 [ n - n - f° r depressus Thomson nee Fabricius]. 



Cleonymus obscurus Walker ; Kerrich & Graham, 1957 : 269-270, $ $. 



Cleonymus obscurus Walker ; Ferriere & Kerrich, 1958, : 25, <J ?• 



Type material. Cleonymus obscurus Walker. Lectotype (possibly holotype) <$ 

 recognized by Kerrich & Graham (1957 : 270) ; it bears a Waterhouse label, and 

 is indexed as Type Hym. 5. 1627. 



Britain, France, Sweden, Czechoslovakia. 



Biology. Reared in France from Scolytus scolytus F. (Kerrich & Graham, 

 1957 : 270) ; Boucek (1958 : 369) considered that a female reared in Czechoslovakia 

 from Hylesinus toranio Bern, probably belonged to obscurus. Imagines July-Aug. 



HEYDENIA Forster 

 Heydenia Forster, 1856 : 46, 48, 49. Type-species : H. pretiosa Forster, by monotypy. 



Heydenia Forster 

 Heydenia Forster 

 Heydenia Forster 

 Heydenia Forster 

 Heydenia Forster 



Schmiedeknecht, 1909 : 154, 156, 158. 

 Nikol'skaya, 1952 : 209. 

 Heqvist, 1957a : 39-48. 

 Boucek, 1958 : 365-369. 

 Peck et al., 1964 : 29. 



Heqvist (1957a) revised the world species of this genus. In Europe only one 

 species is known to occur. 



Heydenia pretiosa Forster 



Heydenia pretiosa Forster, 1856 : 49, <J ?• 

 Heydenia excellens Wachtl, 1889 : 89-91, <£ $. 

 Lycisca Silvestrii Russo, 1939 : 195-205, $ $. 



